131658664 has 8 divisors (see below), whose sum is σ = 246860010. Its totient is φ = 65829328.

The previous prime is 131658661. The next prime is 131658689. The reversal of 131658664 is 466856131.

It can be written as a sum of positive squares in only one way, i.e., 115992900 + 15665764 = 10770^2 + 3958^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (131658661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8228659 + ... + 8228674.

Almost surely, 2^131658664 is an apocalyptic number.

It is an amenable number.

131658664 is a deficient number, since it is larger than the sum of its proper divisors (115201346).

131658664 is a wasteful number, since it uses less digits than its factorization.

131658664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16457339 (or 16457335 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 131658664 is about 11474.2609348053. The cubic root of 131658664 is about 508.7250790393.

The spelling of 131658664 in words is "one hundred thirty-one million, six hundred fifty-eight thousand, six hundred sixty-four".